Rayleigh-Benard convection Rayleigh Number Nusselt Number total heat flux conductive heat flux.

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Presentation transcript:

Rayleigh-Benard convection Rayleigh Number Nusselt Number total heat flux conductive heat flux

Turbulent Convection Experimental set up d = 20 cm Lx =40 cm Ly = 10 cm Temperature profiles Nu versus Ra

Heat transport in turbulent convection When the system is turbulent: probe

Variable employed for the test

PDF of temperature at Ra=10 10

Deviation from a Gaussian as a function of 

PDF of temperature at Ra=10 10 We select an interval around zero and we compute

with We find:        Therefore the temperature PDF verifies for -0.5<Y<0.5

A good rescaling of the PDF is obatined for all values of  Scaling Function We modify the Sinai scaling function in the following way:

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